Support different page orientations

Author: jackpot51

src/print.rs

@@ -1,4 +1,4 @@
-use ashpd::desktop::print::{PageSetup, PrintProxy};
+use ashpd::desktop::print::{Orientation, PageSetup, PrintProxy, Settings};
 use cosmic_text::{Buffer, Scroll, fontdb};
 use printpdf::*;
 use std::{
@@ -69,21 +69,59 @@ fn generate_pdf<W: Write>(buffer: &mut Buffer, page_setup: &PageSetup, w: &mut W
     let mut doc = PdfDocument::new("");
     let mut pdf_fonts: HashMap<fontdb::ID, Option<FontId>> = HashMap::new();
 
-    //TODO: handle landscape mode
     let outer_width = Mm(page_setup.width.unwrap_or(216.0) as f32);
     let outer_height = Mm(page_setup.height.unwrap_or(279.0) as f32);
     let margin_top = Mm(page_setup.margin_top.unwrap_or(25.4) as f32);
     let margin_bottom = Mm(page_setup.margin_bottom.unwrap_or(25.4) as f32);
     let margin_left = Mm(page_setup.margin_left.unwrap_or(25.4) as f32);
     let margin_right = Mm(page_setup.margin_right.unwrap_or(25.4) as f32);
-    let inner_width = outer_width - margin_left - margin_right;
-    let inner_height = outer_height - margin_top - margin_bottom;
+    let inner_width_mm = outer_width - margin_left - margin_right;
+    let inner_height_mm = outer_height - margin_top - margin_bottom;
     let dpi = 96.0;
-    let buffer_width = inner_width.into_pt().into_px(dpi).0 as f32;
-    let buffer_height = inner_height.into_pt().into_px(dpi).0 as f32;
+    let inner_width_px = inner_width_mm.into_pt().into_px(dpi);
+    let inner_height_px = inner_height_mm.into_pt().into_px(dpi);
     let metrics = buffer.metrics();
     let font_size = Px(metrics.font_size as usize).into_pt(dpi);
     let line_height = Px(metrics.line_height as usize).into_pt(dpi);
+    let (buffer_width, buffer_height, matrix) =
+        match page_setup.orientation.unwrap_or(Orientation::Portrait) {
+            Orientation::Portrait => (
+                inner_width_px.0 as f32,
+                inner_height_px.0 as f32,
+                TextMatrix::TranslateRotate(
+                    Pt::from(margin_left),
+                    Pt::from(outer_height - margin_top) - line_height,
+                    0.0,
+                ),
+            ),
+            Orientation::Landscape => (
+                inner_height_px.0 as f32,
+                inner_width_px.0 as f32,
+                TextMatrix::TranslateRotate(
+                    Pt::from(margin_top) + line_height,
+                    Pt::from(margin_left),
+                    90.0,
+                ),
+            ),
+            Orientation::ReversePortrait => (
+                inner_width_px.0 as f32,
+                inner_height_px.0 as f32,
+                TextMatrix::TranslateRotate(
+                    Pt::from(outer_width - margin_left),
+                    Pt::from(margin_top) + line_height,
+                    180.0,
+                ),
+            ),
+            Orientation::ReverseLandscape => (
+                inner_height_px.0 as f32,
+                inner_width_px.0 as f32,
+                TextMatrix::TranslateRotate(
+                    Pt::from(outer_width - margin_left) - line_height,
+                    Pt::from(outer_height - margin_top),
+                    270.0,
+                ),
+            ),
+        };
 
     {
         let mut font_system = font_system().write().unwrap();
@@ -98,9 +136,7 @@ fn generate_pdf<W: Write>(buffer: &mut Buffer, page_setup: &PageSetup, w: &mut W
         let mut ops = vec![
             Op::SaveGraphicsState,
             Op::StartTextSection,
-            Op::SetTextCursor {
-                pos: Point::new(margin_left, outer_height - margin_top - line_height.into()),
-            },
+            Op::SetTextMatrix { matrix },
             Op::SetLineHeight { lh: line_height },
         ];
 
@@ -170,8 +206,8 @@ pub(crate) async fn print(mut buffer: Arc<Buffer>) -> Result<(), Box<dyn Error>>
         .prepare_print(
             window_id,
             &title,
-            Default::default(),
-            Default::default(),
+            Settings::default(),
+            PageSetup::default(),
             None,
             modal,
         )